Hi,
sorry this is not a feature, but there are two way to do this:

1. Client side via Javascript

jQuery(document).ready(function($){

  if($('#jform_hidden_field_alias').val()=='your_test_value1') $('#jform_radio_alias').val('your_value1');

  if($('#jform_hidden_field_alias').val()=='your_test_value2') $('#jform_radio_alias').val('your_value2');

});

2. Server side via plugin, you can develop plugin based on our skeleton plugin (you can download this at the end of docs page). Docs at https://www.easy-profile.com/docs/44-triggers.html
- delete samples functions: triggerFieldAvatarUpdate, triggerProfileUpdate
- write a function like this:

triggerProfileUpdate($user,&$data,$changed,$isNew){ 

  if($data['hidden_field_alias']=='your_test_value1') $data['radio_field_alias']='your_value1';

  if($data['hidden_field_alias']=='your_test_value2') $data['radio_field_alias']='your_value2';

}